# - Check if a symbol exists as a function, variable, or macro # CHECK_SYMBOL_EXISTS(<symbol> <files> <variable>) # # Check that the <symbol> is available after including given header # <files> and store the result in a <variable>. Specify the list # of files in one argument as a semicolon-separated list. # # If the header files define the symbol as a macro it is considered # available and assumed to work. If the header files declare the # symbol as a function or variable then the symbol must also be # available for linking. If the symbol is a type or enum value # it will not be recognized (consider using CheckTypeSize or # CheckCSourceCompiles). # # The following variables may be set before calling this macro to # modify the way the check is run: # # CMAKE_REQUIRED_FLAGS = string of compile command line flags # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) # CMAKE_REQUIRED_INCLUDES = list of include directories # CMAKE_REQUIRED_LIBRARIES = list of libraries to link #============================================================================= # Copyright 2003-2011 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) MACRO(CHECK_SHARED_FUNCTION_EXISTS SYMBOL FILES LIBRARY LOCATION VARIABLE) IF("${VARIABLE}" MATCHES "^${VARIABLE}$") SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n") SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS}) IF(CMAKE_REQUIRED_LIBRARIES) SET(CHECK_SYMBOL_EXISTS_LIBS "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES};${LIBRARY}") ELSE(CMAKE_REQUIRED_LIBRARIES) SET(CHECK_SYMBOL_EXISTS_LIBS "-DLINK_LIBRARIES:STRING=${LIBRARY}") ENDIF(CMAKE_REQUIRED_LIBRARIES) IF(CMAKE_REQUIRED_INCLUDES) SET(CMAKE_SYMBOL_EXISTS_INCLUDES "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") ELSE(CMAKE_REQUIRED_INCLUDES) SET(CMAKE_SYMBOL_EXISTS_INCLUDES) ENDIF(CMAKE_REQUIRED_INCLUDES) FOREACH(FILE ${FILES}) SET(CMAKE_CONFIGURABLE_FILE_CONTENT "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n") ENDFOREACH(FILE) SET(CMAKE_CONFIGURABLE_FILE_CONTENT "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n cmakeRequireSymbol(0,&${SYMBOL});\n return 0;\n}\n") CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in" "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY) MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY}") TRY_COMPILE(${VARIABLE} ${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS} -DLINK_DIRECTORIES:STRING=${LOCATION} "${CHECK_SYMBOL_EXISTS_LIBS}" "${CMAKE_SYMBOL_EXISTS_INCLUDES}" OUTPUT_VARIABLE OUTPUT) IF(${VARIABLE}) MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - found") SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}") FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log "Determining if the ${SYMBOL} " "exist in ${LIBRARY} passed with the following output:\n" "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n" "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") ELSE(${VARIABLE}) MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - not found.") SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}") FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Determining if the ${SYMBOL} " "exist in ${LIBRARY} failed with the following output:\n" "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n" "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") ENDIF(${VARIABLE}) ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$") ENDMACRO(CHECK_SHARED_FUNCTION_EXISTS)